21543245022 has 64 divisors (see below), whose sum is σ = 48033538560. Its totient is φ = 6395760000.

The previous prime is 21543244963. The next prime is 21543245023. The reversal of 21543245022 is 22054234512.

It is a super-2 number, since 2×21543245022² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21543245023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5089647 + ... + 5093877.

It is an arithmetic number, because the mean of its divisors is an integer number (750524040).

Almost surely, 2^21543245022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21543245022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24016769280).

21543245022 is an abundant number, since it is smaller than the sum of its proper divisors (26490293538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21543245022 is a wasteful number, since it uses less digits than its factorization.

21543245022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6529.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21543245022 its reverse (22054234512), we get a palindrome (43597479534).

The spelling of 21543245022 in words is "twenty-one billion, five hundred forty-three million, two hundred forty-five thousand, twenty-two".